https://scholars.lib.ntu.edu.tw/handle/123456789/630809
標題: | Unexpected reversible crystalline/amorphous (de)lithiation transformations enabling fast (dis)charge of high-capacity anatase mesocrystal anode | 作者: | Wu, Junxiu Liu, Hao Wen Tang, Anwen Zhang, Weifeng Sheu, Hwo Shuenn Lee, Jyh Fu Liao, Yen Fa Huang, Shuping Wei, Mingdeng NAE-LIH WU |
關鍵字: | Anatase TiO 2 | Fast charging | Li-ion battery | Mesocrystal | Phase transformation | 公開日期: | 1-十一月-2022 | 出版社: | ELSEVIER | 卷: | 102 | 來源出版物: | Nano Energy | 摘要: | High-power, fast-charging capability is an urgent issue for the development of advanced Li-ion batteries (LIBs) for electrified mobility applications. An anatase titanium oxide mesocrystal (TOM) Li-ion battery (LIB) anode comprising extremely small (3–5 nm) and crystallographically coherent nanocrystallite subunits demonstrate a high specific capacity (up to 225 mAh g-1) and extraordinary rate capability and cycle stability under stressful currents (83 % capacity retention after 9000 cycles at 10 C rate, 1 C = 168 mA g-1), considerably outperforming the conventional nanocrystalline titanium oxide (TO) electrode. The investigation of the underlying (de)lithiation mechanism using synchrotron X-ray analyses and density functional theory calculations reveals a novel crystalline–amorphous–crystalline pathway for TOM involving an amorphous phase existing within a Li stoichiometry range approximately LixTiO2, x = 0.2–0.9. The combination of structure amorphization and existing of a fast inter-grain diffusion network inherent to the hierarchical interior of mesocrystal empowers the TOM electrode with orders-of-magnitude higher diffusion rates as compared with the TO electrode. The single-crystal-like crystallographic coherence of the (de)lithiation end-products enables favorable chemo-mechanical stability to avert particle cracking during high-rate cycling. The study indicates a potential new direction for engineering cycle-stable fast-charging electrode materials. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/630809 | ISSN: | 22112855 | DOI: | 10.1016/j.nanoen.2022.107715 |
顯示於: | 化學工程學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。